# CVE-2026-115679: Arm Keil MDK-Middleware FTP Server out-of-bounds buffer access

Source: https://junglewise.ai/threats/cve-2026-115679-arm-keil-mdk-middleware-8-3-0-may-allow-out-of-bounds-reads-and  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

CVE-2026-115679 · Severity: info · Published 2026-10-26

Arm Keil MDK-Middleware is a software development kit used to build embedded applications. A flaw in the FTP Server component allows out-of-bounds reads and writes to its receive buffer, potentially leading to information disclosure or code execution on devices running affected middleware versions.

Technologies: [Arm Keil MDK-Middleware](https://junglewise.ai/threats/technologies/keil-mdk-middleware). Vendors: [Arm](https://junglewise.ai/threats/vendors/arm).

## Quick answers

**Is CVE-2026-115679 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115679 being exploited in the wild.

**How severe is CVE-2026-115679?** Informational severity, published 26 October 2026.

**Which products and versions are affected?** Arm Keil MDK-Middleware 8.3.0.

**Is there a fix for CVE-2026-115679?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-115679 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-115679?** Check whether you run Arm Keil MDK-Middleware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an out-of-bounds buffer access flaw in the FTP Server RX Buffer of Arm Keil MDK-Middleware 8.3.0. This permits both reads and writes beyond allocated buffer boundaries, reachable over the network via FTP protocol interactions. Exploitation could lead to information disclosure or arbitrary code execution depending on the application context.

## Affected products

- Arm Keil MDK-Middleware 8.3.0

## Timeline

- 2026-10-26: disclosed

## References

- [https://support.arm.com/documentation/112560](https://support.arm.com/documentation/112560)

## Related threats

- [Arm Keil MDK-Middleware DHCPv6 option over-read and data retransmission](https://junglewise.ai/threats/cve-2026-115680-arm-keil-mdk-middleware-8-0-0-8-3-0-may-allow-dhcpv6-option-walk)
- [Arm Keil MDK-Middleware out-of-bounds read in SNMP processing](https://junglewise.ai/threats/cve-2026-115678-arm-keil-mdk-middleware-8-0-0-8-3-0-may-allow-pre-authentication)